應用EPOXY黏結劑圍束CFRP混凝土定載下高溫性能之研究

On the performance of CFRP Confined Concrete under high temperature with constant load

宋中仁(chung-jen Sung)

指導教授 ： 吳傳威

國立臺北科技大學/工程學院/土木與防災研究所/碩士(2005年)

摘要

建築物或結構體因年久老化或地震損傷造成安全性不足，有時需加以修復補強。在目前常用的諸多工法中，以鋼板或纖維複合材料(FRP)包覆混凝土構件的補強方法甚為普遍。而纖維複合材料與混凝土界面間之黏著劑最常採用者則為環氧樹脂。因環氧樹脂之熱變形溫度約僅50℃左右，高溫易使黏著界面產生脫落。前期的研究曾發現，當包覆單層和雙層CFRP之混凝土試體，分別在250℃和300℃失去其圍束效果。本研究之目的則在於瞭解碳纖維複合材料包覆混凝土構材在承受超過原始之壓力下之高溫性能。
本實驗研究之結果顯示對於強度約135kgf/cm2之混凝土試體，包覆單層和雙層CFRP後，在固定軸壓下分別在303℃和365.5℃失去其圍束效果；顯示在定載下試體失去圍束效果之溫度較定溫為高。另當單層與雙層CFRP圍束混凝土之試體圍束力失效溫度之時間，經CNS 12514標準加溫-時間曲線修正時間分別為42.09及67.75秒，而超過混凝土本身抗壓強度之載重試體會瞬間破壞；就黏結圍束力而言，在高溫下包覆雙層CFRP較包覆單層CFRP效果較佳。

關鍵字

碳纖維圍束 ； 圍束失效溫度 ； 環氧樹脂

並列摘要

A building or a structure may wear down by it years without repairing or damage of an earthquake，at times needs moreovern repair。In the common methods of repairing，using a steel plate or FRP tie the structural concrete，is the most general method。Using FRP and concrete with universal epoxy between。Because the hot deformed temperature of epoxy is only approach 50℃，the high temperature can make fall off from agglutinate interface easily。the previous results obtain that concrete cylinders with covering one or two layers of CFRP，lost effect of confinement at 250℃ and 300℃0。The purpose of the research is reallzing that CFRP confined concrete surpasses allow strength of the concrete itself axial pressure the comportment of high temperature。
The experimental results show that concrete cylinders with strength 135kgf/cm2 covered by one and two layers of CFRP . lost effect of confinement at 303℃ and 365.5℃，it shows the constant load loses encircles the effect temperature is higher then at constant temperature。Besides one and two layers of CFRP .they will lost effect of using CNS 12514 normalat add temperature - time curves correct confinement at 42.09 and 67.75 seconds，another surpasses allow strength of the concrete itself compressive by a constant pressure tries the body meet the instantaneous destruction；Based on the strength of bonding，the effect two layers of CFRP is better than one layer of CFRP under high temperature.

並列關鍵字

CFRP jacketed ； temperature of losing bound effect ； EPOXY

參考文獻

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